.125  round   art

When I was Shooting silhouette I used either the thinnest post if visibility was good, on days I could not see as well I switched to the widest post. Most of the other shooters used a front circle that varied in size depending on conditions. Today everybody is getting up in years and seem to be switching to scopes.

By far the most common is the aperture insert. I'll shoot about 25 matches a season, including 4 or 5 regionals and the nationals and it is unusual to find someone not shooting aperture inserts in their globe sight. Many, if not most, will change the aperture diameter depending on which animal they are shooting. I like the heavy inserts that Distant Thunder offers, but many folks use the smaller thickness inserts. Am lucky enough to shoot with the person who has arguably dominated BPCR over the past 10-15 years (several times nat'l champion and holder of many nat'l records). At times when the light is bad he has gone to a thin post and even no front insert in order to get enough light to see the target (animal).

     I have been doing this for more than a few years now, and as the eye-sight fails a bit have been trying different things.    The heavy apertures usually found with the Lyman target sights are good on paper bullseyes, but the thinner-rimmed ones do better for me on silhouettes.  I tried a "caliper" type front, with thin posts coming in from the sides, but it was hard to get one just right.   I found that I could get a good sight picture on PIGs and RAMs with an upside-down post (desperate, here!), but couldn't pull the trigger.   60 years of hand-eye coordination with a post UNDER the target is hard to re-train.  I really think most folks will do best with the THIN rimmed apertures on these irregular targets with poor contrast.

CHRIS
RGChristensen

For what it's worth,

Years ago,I ran a test with arpeture front sights at 10 Meters on the official NRA paper silhouette target. Air rifle rested indoors. It will put every pellet in one hole so I assumed error was sighting error.  Target is scaled all shots at 10 meters. Visual is the same as outdoor targets gun zeroed on a bullseye target then no more sight adjustments. .

Chickens and Pigs the hole was perfectly centered animal facing left or right. However the Pig target showed wider horizontal dispersion. Not a lot but noticeable .  Moving to the turkey target there is a very small bias toward the Breast  

Ram was the significant difference. Strikes moved toward the head . Difference right facing and left facing ram was about 3 MOA.  Mass of the head pulls the strike 1 1/2 MOA .  About because dealing with such small targets precise measurement was difficult.

My takeaway is error so small it can be ignored CPT  Rams if one bank or your zero is right facing and you have to shift to left facing make a wind adjustment.  Of course wind being the significant factor at 500 tweaking a point or too may be dressing the sight picture up too much. Still it's good to know what the sight is doing.

Boats

As I've gotten older I find that a larger aperture seems to work better especially on the turkeys. Like Glenn I prefer the thicker ring on the aperture and I usually put in two, the one I plan to shoot with and the next larger one to give me the thicker ring. 

Once in foggy conditions I used the upside down post on pigs and turkeys as Chris mentioned with good results. I tried it again on a better vision day with not so good results

It's very individual I have shot 10 M Airgun at Bullseye targets indoors with a lot of High School and College shooters, all use a post. It's bullseye width and they use a bottom of bull hold.

If you can focus smaller the front sight better you can pick the spot on a Silhouette target. If you can Focus is the question.

  Apertures are much easier on my eyes. Post and bead I only get a few seconds of sharp focus, If I can't get the shot off it's close my eyes then try it again. Some times as many as 3 or 4 tries before I get a good sight picture.

Boats